Bit breaker



W. P. KINCAID BIT BREAKER March 19, 1940.

Filed Oct. 12, 1959 .Z/YVE/VTO/P. WP. MIC/1 10.

Patented Mar. 19, 1940 v I 2,194,090

UNITED STATES ATENT" oFFicE BIT BREAKER Wesley P. Kincaid, Oklahoma City, Okla, as-

signor to Reed Roller Bit Company, Houston, Tex, a corporation of Texas Application October 12, 1939, Serial. No. 299,057

4 Claims. (01. 255- 1) This invention relates to bit breakers, for use iEa, and the edges of the aperture are "closed on in rotary oil well drilling in removing rotary bits the reduced portion of the bit. They can then from drill collars. Y hold the bit breaker in position while the bit is In this art, when a drill bit is pulled out of lowered until the plate It, Illa fits in the recess 5 the hole to be changed, some means must be proon the top of the rotary table. (It will be obvious vided for holding the bit while the threaded couthat the weight of the biton the supporting pling or drill collar which attaches it to the drill members i3, l 3 ct causes the bit to be gripped string is broken out and unscrewed. For this tighter by the edges of the aperture H.) The purpose an auxiliary bit-holding device is utilized drill collar may'then be broken out and the bit m which fits in the rotary table and supports the bit, removed from the bit breaker.

at the same time holding it from rotation with Although a preferred embodiment of my inrespect to the table. Heretofore such devices ,vcntion is herein disclosed, I do not wish to be have taken the form. of break out plates so delimited thereto, but only to the scope of the apsigned that they received and'engaged the bits pended claims I at about the level of their cutters or cutting por- I claim: I i tions. 1. In a bit breaker, a pair of opposing plates It is an object of this invention to provide a positioned so that their edges will contact and break out plate which will engage the-shank of o d a dr it h ebe w en, and Suppertihg go a bit above its cutting portion and thus avoid meehs h neine a plates together 0 a the any injury to the cutting portions of the bits. Weight of a bit on the supporting means will cause v Other objects and features will become evident thep e to p e 011 t from the following disclosure, taken in connec- 2. In a bit breaker, 81 o pp Plates tion with the accompanying drawing; in whichpositioned normally in thesame plane so that Fig. 1 is a plan view of the bit breaker; I their edges will contact and hold a drill ,bit 25 Fig; 2 is a side elevation of the bit breaker in ther betWeen, depe ding -s aped Supp position in thetop of arotary table; and members m integral W Said P Said Fig. 3 is a side elevation of the bit breaker. m m er hin d t h r ow said plates in Referring'to the drawing in detail, plates ill, position to support a'bit so that the weight of iila, are identical in shape, and may be cast from e bit Will cause the plates to press on the 30 the same pattern. They are of such ashape that In a bit breaker, pp plates P they snugly fit into the top of the rotary. table, tioned normally in a horizontal plane, a bit enin the square recess which carries the drive bush-' gaging p tu e fo med in t e Opposing edges of ing, as shown in Fig. 2. The plates .Hlareformed said plates, p L- p Supporting m mwlth an aperture H shaped to receive d h ld hers made integral with said plates, said members a drill bit, at a point spaced from its end. Hanhinged to et b w s ape ure in position dles I2, I21; are welded to the top of the halves, to S pp a b o at t e Weight of the bit will so the device may be conveniently lifted and cause the edges of the aperture 170 press 011 the handled for attachment and detachment. bit. Y

Below the plate halves there are, formed inte- 4. In a bit breaker, t P e e e he form- 40 gral therewith, inwardly disposed L-shaped supns substantially a Square p n it di sporting memberslt, i3a, joined by a hinge M of onel, a b t en aging aperture formed out of both conventional construction. Where the two halves p a y t al 0n t e dividing line between. meet (seeFig. 1) there are also formed-oppositely e W10 p lugs and welding per u es in disposedv lugs and coacting apertures 15 which ei dlfl edges 0f the tWO pl a handle 5 prevent any sideways stress on the hinge when on each plate, a depending L-shaped supporting the plates are being closed on the bit. member made integral with each plate, said In operation, the bit is pulled out of thehole members hinged together so that the weight of and raised to a point about a foot above the rothe bit on the supporting members causes the tary table. Two men then grasp the bitbreaker edges of the aperture to press against the side of 50 e by the handles 12 and 12a, holding it open, and thebit; a l I slipit on the bit past the end thereof until the WESLEY P. KINCAID. end engages the supporting members 13 and e 

